The task is created on the basis of e-mail. Whether can make so that the user to whom this task is appointed could see this letter (a body of the letter and the atach..)
Please right-click on a project, go to "Email tasks to this project" and you'll see the email address of this project to which you can send/forward messages - they will convert into tasks with the body becoming a task note.
This way someone else can see the body as linking to emails will require having access to the email account and computer on which this email is stored.
It not convenient way. It is possible not to have access to a sender account, and to keep a letter and appendix body in notes. It would be good to make it as standard function
I am not sure of the issue. The method David describes allows anyone who has access to this task see the title of the email.